As part of a bet with an unearthly being, you are banished thousands of years into the past, to the height of the Roman Empire. If you can replace Julius Ceasar as ruler within three months, with the full support of the senate, you win the bet and can return to your own time. Otherwise, you will remain stuck in the past, away from your family forever. You can only bring two items from modern times to help you succeed in your challenge. What two items do you bring?